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Subkiloparsec Imaging of Lyα Emission in a Low-mass, Highly Ionized, Gravitationally Lensed Galaxy at z=1.84
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). University of Wisconsin-Milwaukee, USA.
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). University of Wisconsin-Milwaukee, USA.
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Number of Authors: 62019 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 884, no 1, article id 7Article in journal (Refereed) Published
Abstract [en]

Low-mass, low-metallicity galaxies at low to moderate (z less than or similar to 3) redshifts offer the best opportunity for detailed examination of the interplay between massive stars, ionizing radiation and gas in sources similar to those that likely reionized the universe. We present new narrowband Hubble Space Telescope observations of Ly alpha emission and the adjacent ultraviolet (UV) continuum in the low-mass (M-star = 2 x 10(8) M-circle dot), low-metallicity (Z similar to 1/20 Z(circle dot)), and highly ionized gravitationally lensed galaxy SL2S J02176-0513 at z.=.1.844. The galaxy has strong Lya emission with photometric equivalent width W-Ly alpha(phot)= 218 +/- 12 angstrom , at odds with the Lya escape fraction of 10%. However, the spectroscopic Ly alpha profile suggests the presence of broad absorption underlying the emission, and the total equivalent width is consistent with the escape fraction once this underlying absorption is included. The Lya emission is more spatially extended than the UV continuum, and the 0 14 spatial resolution of HST coupled with the magnification of gravitational lensing enables us to examine the distribution of Ly alpha and the UV continuum on subkiloparsec scales. We find that the peaks of the Ly alpha emission and the UV continuum are offset by 650 pc, and there is no Ly alpha emission arising from the region with the strongest UV light. Our combined spectroscopic and imaging data imply a significant range in neutral hydrogen column density across the object. These observations offer indirect support for a model in which ionizing radiation escapes from galaxies through channels with low column density of neutral gas.

Place, publisher, year, edition, pages
2019. Vol. 884, no 1, article id 7
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Physical Sciences
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URN: urn:nbn:se:su:diva-177525DOI: 10.3847/1538-4357/ab3dafISI: 000501608200007OAI: oai:DiVA.org:su-177525DiVA, id: diva2:1383758
Available from: 2020-01-08 Created: 2020-01-08 Last updated: 2020-01-08Bibliographically approved

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